Squashed the following commits:
5c723ad commit: Fix: Includes alpha sort
15ac350 commit: Fix: Updated Database::kSchemaVersion to 49.
767a26a commit: Fixed small code style issue. Added schema-49 to data.qrc instead schema-48
bf6aa64 commit: fixup! Modified async handling of CollapsibleInfoPane as recommended by Andreas. Display of IDv2 tag lyrics works now.
c1f97e9 commit: fixup! Added support to read/display the ID tag lyrics in MP3 files:
c946b1d commit: Added support to read/display the ID tag lyrics in MP3 files:
-Added schema to the database to store it
-Added readers/writers for ID tags
-Added readers/writers for the database to the song class
-Added the taglyricsinfoprovider to show the lyrics in songinfo
The transaction handling while upgrading the database schema had to be revised.
Furthermore some QSqlQuery statements needed to be finished properly.
Fixes issue 2556
